[SpasticPlastic]

All air fresheners have ethanol and other solvents that could, in theory, dissolve plastic. I'm not super familiar with the Mezco stands. If there is a coating over the plastic of the stand to avoid scratches and scrapes, it could be that the solvents have eaten through the coating and basically left you with "water spots". Again, I'm not sure if the stands have a coating, are made of a cheaper plastic, or what. If you've never had a problem with any other stands or figures, my guess is the combinations of the solvents and the chemical make-up of the plastics in the stand and sword are to blame.

Goo Gone is chock full of harsh chemicals, so that could have actually made the problem worse. Alcohol is pretty rough, too.

I guess, if it were me and I've tried a bunch of stuff and have chalked the stand up as a loss, I would try to gently sand through the very first layer of the stand, with a very fine grit, to see if it is just a surface marring. This is not an ideal solution, mind you, as this might damage the picture of the cricket or whatever that is. If that actually worked, you could hit the stand with a clear coat to give it some gloss back.